Abrading or polishing machine.



no. 629,885. I Patented Aug. 1,1899;

. 0. BECKER.

ABRADING on Pousnme momma.

(Apylicstiun filed Jan. 9, 1899.)

2 Sheets- 8M 2.

(No Model.)

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cnn srmn BECKER; or nnrorr,

.inlcr-nsnconrnnr, or sAnErLAcnj AssAnmefon POLLSl-llNG mem s s."

SiPECIFICATION'forming part of Letters resent No. 629,885, dated. August 1, 1899. I Applicetion filed January 9,1899; Serial 110.701542. lilo inodel.) H I v I To all whom it may concern:

Be it known that I, CHRISTIAN BECKER, a. citizen of the United States, residi'ngat Beloit,

in the county of Rock and State of Wisconsin,

5 have invented a new and useful Abrnding or Polishing lllechine, of which the following is a. specification in its 1) .sliorm now known, to

me, reference being bad to the accompanying drawings.

to My invention relates to machines for pol ishing and finishing wood, iron, or otherlmaterials.

It consists particularly in a machine in which a continuously-moving, flexible, and

15 approximately flat abrading or polishing pad I is presented to the work. Many machines having one or more cylindrical abrading or polishing rolls have-been heretofore used, and

I do not claim these. Itslso consists in the form and construction of the pad and the method of securing the abrading or polishing materiel thereto. It also relates to the means of driving and controlling the pad and to details of constrnci z 5 tion hereinafter in ore fully described and claimed. v

For convenience the machine is shown and will be described as n, wood-polishing ma, chine; but by substituting einery-paper or other abrading material for the sandpaper it may be used on iron and many other materials. In the drawings, Figure 1 is an end, Fig.2 a side sectional view, Fig. 3 a. plan, and Fig. 4 an end sectional View, of my improved ma.-

chine. Fig. 5 is a detail of the belt. Fig. 6 is 2. detail view of the fced-table between the rollers and the rollcr bearings; V Mounted in suitable end frames 11 is a. 40 main shaft 12, having rigidly secured to it a flanged pulley 13. On the end of each end frame 11 are bolts 14, passing through slotted holes 15 in a yoke 16. The yoke is adapted to slide up and down on the frame between 5 guiding-lugs 17. In the center of the end frame is another lug 18, in which a screw 1-9 is adapted to turn up and down. also passes through lugs 20.011 yoke 16 and has rigidly secured to it between themrthe' 5o nut 21, so that turning this nut will trim the j screw and move the whole yoke up and down.

This screw Passing through-the side lugs 22 on the yoke 16 are set-screws 23, which screw into and rigidly hold bearings 24: for shaft 12. It will tighteningthe other the shaft may beadjusted sidewise, and that by loosening screws 14 and turning screw screws .14 the whole may be securely locked in position. adjustments,

large rectangular openings 27.

with the openings 27 of. the end frames are secured by bolts 28 the castings. 29. oi these castings is the rectangular slot 30.

--{lhe rollers 31 are jonrnaled on castings 32,

and where it extends beyond the rollers is a. rectangular bar 34, adaptedto fit in and endwise in the slot in casting 29. .The rectangular bar has bolted to Why bolts 3-5 rollers, as above described.

At one end of the machine the barfil of the feed-table is rigidly connected by red 36to the shaft 12, so that the flanged druinl3 and the rollers 31 maybe, if desired, reciprocated end wise. The extent of such motionis limited by a, screw-or pin 37, rigidly securedto. her

. 30 and adapted to slide in a slotted hole out 7 The screws 28in casting 29 pass through slots 38 ingrsble 26, so that by moving the screws the casti ngs,end

in the side of casting .29.

vconsequentl y the rollers,'are-cepeble of a side'- wise adjustment.

Passing over the flanged pulley 13 alndf the its outer edges. The width of the belt, or, rather, the widthjbetween these flanges 40, is the width of the workingsurface of tire. ma.- chine. Stretched around this lezitheiicenbe seen that byloosening one screw 23 end The end frames are rigidly attached together by suitable connecting-rodsand braces 25 and the top plate or working table 26. To the under side of this table 26and inline In each slide the -castin"s 32 which form bearin 's for the Wisconsin, ASSIGNOR ro rn'n ni-"rr soni I 19 by nut 21 the yoke 16, and consequently shaft 12, may be raised or, lowered, and that by thentightening To accommodate this and other the end frames have in them the (on dotted lines, Fig. 3,) bolted to the feed. table 33, which is between the rollers. This feed-table between the rollers is of a semi-* triangular cross-section, as shown in Fig. 4,. a

. V 9'5 rollers 31 isa. belt 39, of-lenther, rubber,,,cainvas,-or other suitable nmterial. The -leeithe" or rubber flanges 40 are riveted to this-belt in" vas, on rubber belt is placed another contin nthis belt of sandpaper 41; but this sandpawr is not secured to the leather by pegs, nails,

glee, orolhormechanical means. The leather vas or other woven materia'l between thesan'dpaper and leather belts. To put on the sandpaper -belt, the leather belt is loosened by raising the shaft 12 and pulley 13 in the manner describedl I then take apiece of sandpaperof sufiicient length and temporarily secure one-end to the leather belt by means of a strip of s ring-steel inserted under the flanges 40. then by hand turn the leather belt a complete revolution, remove the steel spring, bring the two ends of the sandpaper together, and glue or cement them. -When the joint is dr I lower the shaft-12 in the manner described to its original position, thus tightening both belts ml by friction sccuring the sandpaper belt 0 the leather one.

. One great 'diiiiculty in aking a satisfacfory abrading-belt is that: he strain due to .the difference in rate of travel ofthe surface of the leather beltand the sandpaper belt-in 3 sandpaper which is mechanically fastened to as'sin over small rollers is so reat that the belt will soon become'very rough and be torn to bits in a very short time, even when it is doing no work. lhe reason is seen in the demonstrated fact that the sandpaper belt on my machine when tightly-stretched on the leather belt gains half an ineh more or less,

' in travel in each complete trip of the leather belt, but it does this without in any way injuring the sandpaper, which maybe used no til it is Worn out in the ordinary course of work. Another diliiculty is that any roughness in a straight-running belt will make straight scratches in the work. By fastening the sandpaper belt in the manner described and b giving the belt a reciprocating motion I hav produced a machine whichdoes away with both of these difiiculties.

The table'26 is cut away, as shown in Figs. 3 andyi, to allow the sandpaper surface to come up on a level with it and to allow for the passage of the flanges 40 of the main belt.

In the operation of my machine I first raise the shaft 12 and apply the sandpaper belt over the leather belt in the manner described.

I then lower the shaft and tighten both belts.

I then apply power to a pulley (not shown) on shaft 12 andrapidly rotate the shaft and pulley 13, thereby causing the sandpaper belt to travel-continuously over the rollers 31 on a level with thetable 26. Wood or other materials which it is desired to polish are now passed along the top of the table and are polished and finished by the broad rapidly-moving flat but flexible pad of sandpa er. "Whenever the sandpaper wears out, all that is necessary is to cut it ofi by running a knife once the length of thepad and put on a now belt tofore described, the large pulley, small roll I ers, and belt'will all move together.

Having thus described myinvention, what I ciai m as new, and desire to secure by Letters Patent, is-

1. In an abrading or polishing machine, the

combination of a working table and a belt of abradin g or polishing material stretched over two or more rollers-adapted to be recipro- 1 cated endwise'so journaled below said table that when said belt is passed over said rollers it will travel flatwise for a considerable distance at substantially the level of the top'of said table.

abrading or polishing material stretched over two or more rollers adapted to bereciprocated endwise so jonrnaled below said ta ble that 2.1m an abradingorpolishingmachine,the" I combination of a wgrking table, a belt of when said belt is passed over said rollers it will travel'flatwise for a. considerable distance at substantially the level of the top of said table, and means for so driving said belt over said rollers.

3. In an abrading or polishing. machine, the

rollers adapted to be reciprocated endwise journaled below said table with their upperover said rollers and pulley, and means for applying. power to said pulley whereby said IOC combination of a working table, two or more belt is made to travel fiatwise over said rollers for a considerable distance at substantially the level of the top of said table.

4. In an abrading or polishingmachine, the combination of a working table and a continuous Working belt adapted to travel for a considerable distanceflatwise along said table. at substantially its upper surface, said work ing belt consisting of an inner permanent flanged belt having corrugations on its surface' and an outer temporary belt, of abrading or polishing materiahstretched over the corrugated surfaces of the first belt, but not otherwise secured thereto.

5. In an abradi-n g or polishing machine, the pombinat-ion of a working table, two or more rollers journaled-below said table with their upper surfaces substantially on a level with the top of said table, a pulley below .said rollers, a permanent flexible belt stretched over said rollers and pulley, another belt of abrading or polishing material stretched over said first belt, but not otherwise secured thereto,

sees-s s and means for applying power to said pulley j whereby the abrading or polishing surface of said second belt 18 lllfldO'llO travel flatwise over said rollers at substantially the level of the top of said table.

6. In a machine of the class described, two or more small rollers adjacent to the feedtable, a pulley below said rollers, a belt cov ered with abrading or polishing material over said rollers and pulley, and a rod rigidly con necting the bearings of said rollers with the shaft of said pulley whereby if said shaft is given an endwisc reciprocating motion said rollers and belt will be given the same motion.

7. In a machine of the class described, two or more small rollers adjacent to the feedtable, a pulley below said I'OllBlSgilbelt over said rollers and pulley, and means for supporting the shaft of said pulley so that it may be adjusted up or down or sidewise whereby said belt may be adjusted upon said pulley and rollers, substantially as described.

8. In an abrading or polishing machine, the

combination of a Working table, and a contin- I nous working belt adapted to travel for a considerable distance llatwise along said table at substantially its upper surface, saidworking"belt'consisting of an inner permanent canvas-belt and an outer temporary belt of alfradin'g or polishing material stretched over said canvas belt, but not-otherwise secured thereto. I

9. In an abrading or polishinginachine, the

- combination of a working table, and a contin uous working belt adapted to travel at substantially its upper surface, said working belt consisting of an inner permanentllanged' secured thereto. I

10. In an abrading or polishing machine,

I the combination of aocntralbaror feed-table,

a pair of rollers journaled in bearings rigidly secured to said iced-table; the top of said feed-table being substantially on alevel with the top of said rollers, substantially as 'de-- scribed. i

11. In an abrading or polishing machine, a

central bar or feed-table, a pair of rollers so journaled in bearings rigidly secured to said feed-table-that the tops of said rollers are approximately on a level with'the top of said feed-table, and a belt) of polishing material stretched over said rollers and feed-table, in combination with a permanent working table in which the central bar or feed-table is so mounted that said polishing-belt will travel flatwise on a level with the top of the working table.

1:2. In an abrading or polishing machine, a central bar or feed-table, apair of rollers so journale'd in bearings rigidly-secured to said iced-table that the tops of said rollers are approximately on a level with the top of said 'feed table, and a belt of polishing material stretched oversaid rollers and feed-table, in

combinationwith a permanent working table in which the centralbar or feed-table is so mounted that said polishing-belt will travel flatwise on a level with the top of the working table and may be simultaneously reciprocated sidewise.

13. In a machine odthe class described, a"

main shaft, a pulley on said shaft, two rollers journaled in bearings rigidly connected to said shaft, and a belt of abrading material stretched over said rollers and pulley, whereby if the shaft be given a reciprocating motion said pulley, roller and belt will be given the same motion.

CHRISTIAN BECKER.

Witnesses:

T. O. IIENDLEY,

F. A. HORSTMANN. 

